Crustal thickness and vP/vS ratio in Shanxi Graben, China

Abstract

Shanxi Graben is in the middle part of the North China Craton, from south to north. With the teleseismic data recorded by Regional Seismograph Networks and the temporary ZBnet-W Seismic Array around east part of Shanxi Graben, we measured the crustal thickness and v P /v S ratio beneath each station using the H-j stack of receiver functions. The observed crustal thickness shows obvious lateral variation, increasing gradually from east to west in the Shanxi Graben. Beneath the Shanxi Graben the crust is relatively thicker than both sides of the south and the north. In addition, the v P /v S ratio in the north of study zone is higher than that in the south. The highest v P /v S ratio exists in the crust of the Xinding basin and the Datong basin. Our study also suggests that high velocity ratio might result from the strong activities of the magmation and volcanism.

Late Cenozoic faulting deformation of the Fanshi Basin (northern Shanxi rift, China), inferred from palaeostress analysis of mesoscale fault-slip data

“…In contrast, graben floor elevations increase northward from 380 to 1010 m (Li et al 2018) and are associated with low Bouguer gravity anomalies, which rise from east (−80 mGal) to west (−130 mGal) as shown by geophysical data (Xu & Ma, 1992). The underlying crust is 32-39 km thick, thinner than the underlying crust of the surrounding mountains (Tang et al 2010), and the Moho depth laterally varies from 36 to 45 km beneath the axial zone (Shi et al 2014).…”